This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 9 |
| 5 | 15 |
| 6 | 25 |
| 7 | 48 |
| 8 | 91 |
| 9 | 169 |
| 10 | 336 |
| 11 | 669 |
| 12 | 1335 |
| 13 | 2665 |
| 14 | 5317 |
| 15 | 10573 |
| 16 | 21037 |
| 17 | 42072 |
| 18 | 84141 |
| 19 | 168279 |
| 20 | 336553 |
| 21 | 673099 |
| 22 | 1345639 |
| 23 | 2691276 |
| 24 | 5382549 |
| 25 | 10765095 |
| 26 | 21528959 |
| 27 | 43057916 |
| 28 | 86115821 |
| 29 | 172231631 |
| 30 | 344463251 |
| 31 | 688926491 |
| 32 | 1377847349 |
| 33 | 2755694696 |
| 34 | 5511375473 |
| 35 | 11022750944 |